Centrifugal pump.



W. KIESER.

CENTRIFUGAL PUMP.

APPLICATION FILED JAN. 7, 1911,

Patented Mar. 10, 1914.

aqhtg.

l nven tor: 7 Kisser; 42m Q.

Witnesses UNITED STATES PATENT OFFICE.

WALTER KIESER, F BERLIN, GERMANY, ASSIGNOR '10 GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YOR CENTRIFUGAL PUMP.

useful Improvements in Centrifugal Pumps,-

of which the following is a specification.

This invention relates to centrlfugal pumps in which the water or other fluid is conducted through a plurality of rapidly rotating throwing wheels or runners, from whose periphery the fluid is thrown into a circumferentialstationary receiving channel. The joint between the edge of the run ner and the'entrance to the receiving chanml is made as fluid-tight as possible, but in any event some of saidfiuid will fail to enter the channel and will pass bcckto the supply ,conduit or passage. This effect is checked as much as possible by interposing a labyrinth packing between the receiving end of the runner andthe surrounding casing, but in spite of this more or less fluid leaks through.

The object of the present invention is to prevent this leakage fluid from producing any serious retarding efi'ect upon the stream of fluid entering the runner. this lealgage fluid has entered thesupply passage in a direction more or less at right angles to the flow of the fluid entering the runner, which tends to impede said flow, .and also constitutes a load which must be overcome by the pump.

In order to avoid this difliculty, the present invention consists in a modification of the joint at the entering end of the runner, whereby the leakage fluid will run into an enlarged battling chamber before entering the supply passage, said chamber being so formed that the leakage fluid when it es-' capes into said passage will no longer'oppose any resistance to the flow of the main stream of fluid.

. In the accompanying drawing, Figure 1 Specification of Letters Patent.

Application filed January 7, 1911.

Heretofore.

Patented Mar. 10, 1914. Serial No. 601,421.

uel t from which the fluid passes to the next runner in a multistage pump, or to the final delivery pipe. The pressure at the outer edge of the runner and in the rceeivingehannel (3 tends to force some of the fluid hack.

7 through the ('lltllllltt'l' in which the runner rotates, to supply or suction passage 4. This tendency is resisted tosome cxtenthy the labyrinth packing at the entrance to the runner, consisting preferably of ribs 7 on the runner alternating with ribs 8 on the adjoining portion of the casing 9. By my invention I provide a chamber to receive. the fluid escaping through this packing, said chamber serving to bafllethe flow of such leakage fluid. In Fig. 1 this batlling chamher is shown as a broad annular space 10 between the end of the runner and a broad flat wall 11 opposite thereto forming part of the casing. \Vhen the leakage fluid strikes this wall, it loses the greater part of its velocity by reason of the impact, by the change of direction ensuing therefrom, and by the width of the chamber. It still enters the supply passage at right angles thereto, but with such reduced velocity as to render it comparatively harmless. In Fig. 2, the fluid passes outof'the packing into an annular groove 12 in the casing-in which its direction is completely reversed, and from which it can escape only by a still further change of direction in order to flow through the gap 13 into the supply passage. In con 1 is a longitudinal section of a portion of the 2,73, and 4 show modifications of the Te m enters the supply passage it is moving in practically the same direction as that of the main stream, and thus offers no obstruction thereto. So in Fig: 4, the leakage fluid after being completely battled by the annular chamber 15 leaves it by a forwardly curved ,casin and run'ne-t' of a centrifugal pump "embo ying one form of my invention; and

Fig. 4 illustrating portions of two 10s I The runner 1 is mounted on the shaft 2 cry ,5 to the cireninfereutiatreeeiving chan- Y annular passage 16. .and has an entrance opening .3 which regis- In accordance with the provisions of the patentstatutes, I have described the principle of operation of my invention, together with the apparatus which I now consider of relatively small diameter and an outlet of considerably larger diameter, a member carried by the casing that extends inwardly. surrounds said inlet and forms the walls of the supply passage, a labyrinth packing carr ed by said runner and member, the parts of which are out of contact, and an annular battling chamber formed between a side face of the member and the face of the inlet end of the runner which is in cominunication with the passage through the packing, receives lluid therefrom and acts to change its direction of flow before discharging it into the inlet of the impeller.

2-. In a centrifugal apparatus, the combination of a casing, a runner having an inletof relatively small diameter and an outlet of considerably larger diameter, a member carried by the casing that extends inwardly,

surrounds said inlet and forms the Walls of the supply passage, a labyrinth packing carried by said runner and member, the Pillie of which are out of contact, an annular baffling chamber formed between a side face of the member and the face of the inlet end of the runner which is in communication with the passage through the packing and receives fluid therefrom, and an annular pasand inlet of the impeller, said passage being inclined inwardly and in the general direction of flow of the moving column of fluid to discharge leakage forwardly into it without substantial shock.

In a centrifugal apparatus, the combination of a casing, a runner having an axially extending portion of relatively small diameter and a radially extending portion of larger diameter, a member carried by the casing and extending inwardly, said member surroi'lnding said axially extending portion, a labyrinth packing carried by said axially extending portion and the adjacent portion of said member, an annular baffling chamber formed in said member for receiving the fluid leaking through the packing, and an annular passage which extends forward from said chamber and communicates with the fluid inlet of the runner whereby the fluid leaking through the packiug into said chamber has its direction changed and is discharged into the runner in the same general direction as that in which the main mass ofthefluid is moving.

i In witness whereof, I have hereiinto set my hand this 22nd day of December, 1910.

\VALTER KIESER.

Witnesses:

FRANL Sonoonnor, HRRMANN HILLE.

sage which communicates with the chamber 

